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Keuning, Lex J.A. (author), Gerritsma, J. (author), van Terwisga, P.F. (author) report 1993
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Gerritsma, J. (author) report 1990
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Gerritsma, J. (author) report 1989
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Gerritsma, J. (author) report 1989
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Gerritsma, J. (author) report 1989
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Gerritsma, J. (author) report 1989
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Gerritsma, J. (author) report 1989
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Gerritsma, J. (author) report 1989
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Gerritsma, J. (author) report 1989
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Gerritsma, J. (author) report 1988
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Gerritsma, J. (author) report 1988
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Gerritsma, J. (author) report 1988
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Gerritsma, J. (author) report 1988
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Gerritsma, J. (author) report 1988
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Gerritsma, J. (author) report 1987
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Gerritsma, J. (author) report 1987
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Gerritsma, J. (author) report 1987
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Gerritsma, J. (author) report 1987
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Gerritsma, J. (author) report 1987
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Gerritsma, J. (author) report 1987